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A count() method is a boolean reduction operation for counting the
number of true elements in a distributed array of boolean values.
This method returns true if and only if count element of source is true.
The prototype is
where the notation boolean
# means a multiarray of arbitrary rank
with elements of type boolean.
The count method is implemented by a schedule object with HPspmd
This class has a constructor with arguments identical to the method above,
and has one public method with no arguments called execute(),
which executes the schedule.
The effective public interface of the Count class is
The source array is source. It will have elements of type boolean.